| HS Code | 197586 |
| Product Model | WWJF-8040 |
| Product Type | Reverse Osmosis Membrane Element |
| Membrane Material | Thin Film Composite (TFC) Polyamide |
| Diameter | 8 inches (201 mm) |
| Length | 40 inches (1016 mm) |
| Permeate Flow Rate | 9500 gallons per day (36 m³/day) |
| Salt Rejection Rate | 99.5% |
| Maximum Operating Pressure | 600 psi (41.4 bar) |
| Maximum Operating Temperature | 45°C (113°F) |
| Operating Ph Range | 2 to 11 |
As an accredited WWJF-8040 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | WWJF-8040 is packaged in sealed 25 kg fiber drums with polyethylene liners, ensuring safe handling, stability, and clear labeling. |
| Container Loading (20′ FCL) | WWJF-8040 loaded in 20′ FCL container, properly packed, secured, and ventilated for safe chemical transport. |
| Shipping | WWJF-8040 should be shipped in tightly sealed, compatible containers, protected from moisture and extreme temperatures. Proper hazard classification, labeling, and safety data sheets must accompany the shipment. Use authorized carriers trained in chemical transport, with spill containment measures and emergency response documentation per applicable regulations. |
| Storage | Store WWJF-8040 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep the container tightly sealed when not in use to prevent moisture contamination or vapor release. Store separately from incompatible materials, and always follow manufacturer instructions and local safety regulations for handling and disposal. |
| Shelf Life | Store in original container in a cool, dry area. Shelf life is 24 months from manufacture date when unopened. |
In unreinforced polypropylene homopolymer for IEC 60898 breaker housings, WWJF-8040 is dry-blended with a 12 g/10 min melt-flow-rate homopolymer and PP-g-MAH at 3 wt% before melt compounding. Compounding is performed on a co-rotating twin-screw extruder with a 40:1 L/D ratio and eleven barrel zones. The temperature profile from feed to die is 170/175/180/185/190/195/200/200/195/190/185°C, screw speed 350 rpm, and melt temperature capped at 205–210°C. Zone 9 is vacuum vented at -0.08 MPa to strip moisture; residual moisture above 0.3 wt% hydrolyses the active phosphorus-oxygen structure and causes vent-port fouling. At 24 wt% loading in a 1.5 mm injection-moulded bar, the five-bar vertical burn test gives UL 94 V-0 with total afterflame time below 50 s across ten ignitions. At 22 wt%, two bars exceed 10 s individual afterflame, producing UL 94 V-2. Limiting oxygen index under ISO 4589-2 rises from 17.8% for the base resin to 28.4% at 24 wt%. Tensile yield stress measured under ASTM D638-14 drops from 32 MPa to 24 MPa; notched Izod impact under ASTM D256-10 Method A drops from 3.8 kJ/m² to 2.1 kJ/m². The practical processing window is 190–205°C; excursions above 210°C cause premature phosphoric acid release, black specks, and screw derating on four-cavity MCCB enclosure tools, while excursions below 190°C produce unwetted agglomerates visible on the moulded surface. WWJF-8040 should be pre-dried at 80°C for 2 h when storage relative humidity exceeds 60%. Avoid metal stearate lubricants above 0.2 wt% because zinc stearate reduces char expansion and produces surface pitting in 1.5 mm plaques.
| WWJF-8040 loading (wt%) | UL 94 at 1.5 mm | LOI (%) under ISO 4589-2 | Tensile yield stress (MPa) under ASTM D638-14 | Notched Izod (kJ/m²) under ASTM D256-10 |
|---|---|---|---|---|
| 0 | HB | 17.8 | 32 | 3.8 |
| 20 | V-2 | 26.0 | 25 | 2.5 |
| 22 | V-2 | 27.1 | 24.5 | 2.3 |
| 24 | V-0 | 28.4 | 24 | 2.1 |
| 26 | V-0 | 29.2 | 23 | 1.9 |
Injection moulding uses a melt temperature of 195–205°C, mould temperature 35°C, and clamp force of 120–140 t for a four-cavity MCCB enclosure tool. The addition of 4 wt% ethylene-octene elastomer recovers some impact loss, but cone calorimetry at 50 kW/m² under ISO 5660-1 shows an 8% increase in peak heat release, requiring revalidation of the IEC 60695-2-11 glow-wire requirement.
Halogen-free EVA jacket compounds for IEC 60332-1-2 building wire use WWJF-8040 in combination with fine-coated aluminium trihydroxide. In a 55 L net chamber internal mixer at fill factor 0.78, an EVA-LDPE blend with 18 wt% vinyl acetate is fluxed at 160°C for 4 min. WWJF-8040 is added at 38–42 wt%, aluminium trihydroxide at 20–25 wt%, and dicumyl peroxide at 0.8 phr. Ram pressure is held at 0.6 MPa. The compound is pelletised through a single-screw extruder with a 120 mesh screen pack to remove undispersed intumescent agglomerates. Crosslinked sheets compressed at 180°C for 10 min to 1.5 mm thickness show tensile strength 11.5 MPa and elongation at break 180% under ISO 37:2017. Oxygen index under ISO 4589-2 is 34.5%. Vertical burn on cable bundles built to IEC 60332-3-24 passes with char length below 1.5 m at 0.9 mm jacket wall thickness. At 42 wt% WWJF-8040, the compound melt-flow index at 190°C/10 kg under ISO 1133-1:2022 drops to 18 g/10 min, and cable extrusion torque rises; at 45 wt%, the jacket surface shows sharkskin on a 90 mm extruder at 25 rpm. The lower loading limit is governed by Joule heating in bundled installations: in a 20-bundle configuration at 35 A conductor current, internal wall temperature reaches 78°C. At that temperature, a 38 wt% jacket softens and char adhesion under the IEC 60332-3 flame source degrades, making 40 wt% the minimum practical loading for this thermal environment.
In solvent-borne epoxy intumescent coatings for H-section structural steel, WWJF-8040 is charged at 18–22 wt% of total batch weight with bisphenol A epoxy resin, ammonium polyphosphate, pentaerythritol, and melamine. The mill base is dispersed at 1200 rpm for 20 min, then ground in a horizontal bead mill to a Hegman fineness of 45 μm. The finished coating has a Stormer viscosity of 95 KU and a density of 1.28 g/cm³. Application to degreased steel with a 60 μm zinc phosphate primer is performed by plural-component airless spray at 0.6 MPa fluid pressure. At 350 μm dry film thickness, the coating achieves 45 min fire resistance in a 50:1 I-section column under GB 14907-2018. At 450 μm DFT, the system reaches 90 min in a loaded column test, with backside steel temperature held below 538°C. Expansion ratio after 30 min at 500°C in a muffle furnace is 32:1 at 20 wt%; below 15 wt%, expansion collapses to 8:1 and char detaches from the substrate. Above 24 wt%, the dry film becomes brittle and pull-off adhesion under ISO 4624:2016 falls below 2.5 MPa. The formulation window lies between a resin-to-FR ratio of 2.8:1 and 3.2:1, with the steel surface grit-blasted to Sa 2.5 and application relative humidity below 75%.
Glass-filled PBT connector bodies for IEC 60309 industrial sockets use WWJF-8040 at 14–18 wt% with 0.4 wt% pentaerythritol tetrastearate lubricant. The PBT base resin is pre-dried at 120°C for 4 h to below 0.05 wt% moisture. Compounding is performed on a 36 mm co-rotating twin-screw extruder at 240–250°C, and injection moulding at 250°C with a mould temperature of 80°C. At 16 wt% loading, the 0.8 mm plaque passes IEC 60695-2-12 glow-wire flammability at 850°C with flame persistence below 5 s. Heat deflection temperature under ISO 75-2:2013 method Af is 196°C. At 20 wt%, the arc tracking resistance falls and may fail the 600 V CTI threshold expected for live-part supports; published data for this specific configuration is limited, and a comparative tracking index test under IEC 60112:2022 is required for final approval.
PA66 terminal blocks moulded for miniature circuit breakers require 0.8 mm UL 94 V-0 and IEC 60695-2-12 glow-wire at 775°C. WWJF-8040 is pre-compounded into PA66 at 18–22 wt%. Pre-drying is mandatory: 100°C for 6 h, because moisture above 0.15 wt% causes hydrolytic chain scission during extrusion at 270–285°C. On a 27 mm twin-screw extruder with 44:1 L/D ratio, the melt temperature is capped at 285°C; above 290°C, the phosphorus-nitrogen system accelerates oxidative discoloration and produces red specks. Injection moulding uses a melt temperature of 280°C, mould temperature 90°C, and injection speed 150 mm/s to minimise premature char formation in hot-runner channels. Tensile strength retention after 1000 h at 150°C under ISO 527-2 is 74% of the unfilled PA66 value, but the compound should not be used for snap-fit designs with high strain because the filled system has limited elongation. Glow-wire ignition at 775°C under IEC 60695-2-13 passes with flame persistence below 5 s at 20 wt%, but flame spread along the terminal can exceed 60 mm if the part wall section drops below 1.2 mm.
Thermoformed polyolefin ceiling panels for rail interiors use WWJF-8040 at 25–30 wt% in a PP-copolymer sheet. The sheet is co-extruded on a 120 mm single-screw extruder at melt temperature 210–220°C and cooled on a three-roll stack at 55°C. The 2.0 mm sheet achieves BS 476 Part 7 Class 1 flame spread and meets the smoke index requirements of EN 13501-1. Addition of WWJF-8040 raises extruder amperage by 15% relative to unfilled PP, requiring die lip adjustment and higher melt pressure. Published data for lower sheet thicknesses in this specific ceiling-panel configuration is limited; pre-production trials should include cone calorimetry at 50 kW/m² under ISO 5660-1.
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Model WWJF-8040 is a spiral-wound thin-film composite polyamide reverse osmosis element in the 8.0 in × 40.0 in (8040) form factor. The membrane leaf consists of a cross-linked aromatic polyamide barrier on a polysulfone support with a nonwoven polyester backing. The element is specified for brackish water desalination, boiler feed polishing, and industrial process water production where continuous feed total dissolved solids remain below 10,000 mg/L. The standard feed spacer thickness is 0.71 mm (28 mil), and the permeate tube inner diameter is 1.5 in (38 mm).
Performance documentation for WWJF-8040 is standardized according to ASTM D4194-23 and ASTM D4516-22. The rated active membrane area is 37.2 m² (400 ft²), with a rated permeate flow of 37.9 m³/day (10,000 gal/day) and a minimum NaCl rejection of 99.5% under test conditions of 2,000 mg/L NaCl, 1,550 kPa (225 psi), 25°C, pH 8, and 15% recovery. Permeate flow is normalized to 25°C; operation at 5°C reduces flow by approximately 30–35% because of increased feed water viscosity and reduced membrane water diffusivity. Maximum applied pressure is 4,140 kPa (600 psi), and maximum operating temperature is 45°C.
The aromatic polyamide barrier layer is approximately 0.2 µm thick; salt passage increases with feed temperature because both solute diffusivity and polymer chain mobility increase. A temperature correction factor of 2.3% per 1°C is typically applied for NaCl passage across the 5–35°C range. Net driving pressure is calculated as the feed-concentrate average pressure minus average osmotic pressure and permeate backpressure; ignoring concentrate osmotic pressure can overpredict permeate flow by 10–20% at 75% recovery when feed TDS exceeds 3,000 mg/L.
In production-scale trains, the element is installed in side-port or end-port 8.0 in fiberglass-reinforced pressure vessels with EPDM brine seals. Two-stage arrays commonly use a 4:2 arrangement, and system recovery is typically controlled between 75% and 85% for groundwater with TDS below 3,000 mg/L. The lead elements in the first stage receive the highest flux and lowest concentrate crossflow velocity; therefore plant logs often record first-stage differential pressure rises before the second stage.
High-bicarbonate groundwaters create calcium carbonate scaling risk when recovery is raised without pH adjustment or threshold inhibitor dosing. For WWJF-8040, the concentrate Langelier Saturation Index calculated according to ASTM D3739-18 should be limited to +0.5 without antiscalant and +2.0 with a verified polycarboxylate or phosphonate antiscalant. At 75% recovery, a feed with 180 mg/L alkalinity as CaCO₃ and 120 mg/L calcium hardness as CaCO₃ can exceed the uninhibited calcite threshold in the second stage; therefore sulfuric acid dosing to pH 6.8–7.2 or antiscalant injection before cartridge filtration is required. Sulfuric acid should be metered continuously because pH excursions above 7.5 may permit calcium carbonate deposition on the concentrate side of the second-stage elements.
The polyamide barrier layer of WWJF-8040 is not chlorine tolerant. Free chlorine in the feed must be maintained below 0.1 mg/L when measured by the DPD method according to ISO 7393-2. Municipal supplies containing chloramine should be dechlorinated with sodium bisulfite or catalytic granular activated carbon, and the downstream oxidation-reduction potential should remain below 300 mV. Chlorine oxidation of the polyamide layer reduces salt rejection before destructive physical failure occurs.
Feed Silt Density Index at 15 minutes should be below 5 for continuous operation; for wastewater reuse or surface water, the SDI15 should be below 3. Post-prefilter turbidity should not exceed 1.0 NTU, and oil and grease must be below 0.1 mg/L. Cationic polyelectrolytes, amine-based antiscalants, and excessive unreacted cationic polymer from upstream clarification are incompatible with the membrane and can cause irreversible permeability loss through adsorption on the polyamide surface.
Operating flux should be maintained between 30 L/m²·h and 38 L/m²·h for low-fouling groundwater and between 20 L/m²·h and 35 L/m²·h for wastewater-derived feed. Exceeding these ranges increases foulant deposition rate and shortens the interval between chemical cleanings. Element differential pressure should not exceed 1.0 bar (15 psi), and vessel differential pressure should not exceed 3.4 bar (50 psi). Permeate backpressure above 0.34 bar (5 psi) can delaminate the membrane envelope and should be prevented during shutdown.
Unused elements are preserved with 1.0% sodium bisulfite solution and should remain sealed at 5–35°C. If the original bag is opened at relative humidity above 60%, the element should be installed within 24 h or re-immersed in preservative to prevent biofilm formation. Freeze damage occurs below 0°C and may not be reversible. After chemical cleaning at pH 2–12 and temperature below 35°C, the element should be rinsed to feed pH for 30 min before returning to service to limit membrane swelling hysteresis.
When WWJF-8040 replaces a lower-pressure low-energy element in an existing train, the same feed pressure will not produce the same normalized permeate flow. The higher standard permeate flow of WWJF-8040 can increase first-stage productivity by 10–15% if the array is not rebalanced. This shifts additional feed water to the second stage and raises tail-element recovery beyond the design point, often above 25% on the last element. Array rebalancing should be performed using membrane projection software that applies ASTM D4516-22 normalized data, and the concentrate throttle should be adjusted to hold the tail-element concentrate flow above 3.0 m³/h per vessel.
Published field log data for WWJF-8040 in this specific configuration is limited. Maintenance records for similar 8040-class brackish elements show first-stage lead elements accumulate silt and iron oxide when pre-filtration falls below 5 µm and SDI15 exceeds 4. Differential pressure on the lead position can increase from 0.5 bar to 1.2 bar within 1,500 h, reducing net driving pressure and shifting flow to downstream elements. If vessel differential pressure reaches 3.4 bar (50 psi), the risk of element telescoping increases and the train should be cleaned or some elements replaced.
WWJF-8040 occupies the brackish-water segment within the 8040 form factor. The barrier layer is more permeable than a seawater element and therefore operates at a lower standard test pressure: 1,550 kPa (225 psi) at 2,000 mg/L NaCl, compared with 5,520 kPa (800 psi) at 32,000 mg/L NaCl for a seawater 8040 element. The trade-off is a lower maximum feed TDS: 10,000 mg/L for WWJF-8040 versus 35,000 mg/L for a seawater element. Above 10,000 mg/L TDS, osmotic pressure consumes sufficient net driving pressure that rated permeate flow cannot be maintained without exceeding the maximum applied pressure.
Relative to a low-energy 8040 element, WWJF-8040 uses a slightly denser barrier layer and offers higher NaCl rejection, typically 99.5% versus 99.2%, but requires about 45% higher standard test pressure. The low-energy product is preferred for low-salinity groundwater where energy cost dominates and 0.3% lower rejection is acceptable. Nanofiltration 8040 elements, by contrast, are rated for divalent ion separation rather than NaCl removal and should not be considered equivalent for applications requiring monovalent salt rejection below 90%.
Compared with cellulosic membranes, the polyamide chemistry of WWJF-8040 allows continuous pH 2–11 and chemical cleaning pH 1–12; however, it cannot tolerate free chlorine levels that cellulosic membranes can accept. This difference must be accounted for when replacing legacy cellulose acetate trains: chlorination previously used for biological control must be eliminated or fully dechlorinated upstream.
| Parameter | WWJF-8040 | Seawater 8040 | Low-Energy 8040 | Nanofiltration 8040 |
|---|---|---|---|---|
| Nominal dimensions | 8.0 in × 40.0 in | 8.0 in × 40.0 in | 8.0 in × 40.0 in | 8.0 in × 40.0 in |
| Active membrane area | 37.2 m² (400 ft²) | 37.2 m² (400 ft²) | 37.2 m² (400 ft²) | 37.2 m² (400 ft²) |
| Standard test salinity | 2,000 mg/L NaCl | 32,000 mg/L NaCl | 2,000 mg/L NaCl | 2,000 mg/L MgSO₄ |
| Standard test pressure | 1,550 kPa (225 psi) | 5,520 kPa (800 psi) | 1,034 kPa (150 psi) | 690 kPa (100 psi) |
| Minimum NaCl rejection | 99.5% | 99.8% | 99.2% | Not rated for NaCl rejection |
| Rated permeate flow | 37.9 m³/day (10,000 gal/day) | 28.4 m³/day (7,500 gal/day) | 41.6 m³/day (11,000 gal/day) | 37.9 m³/day (10,000 gal/day) |
| Maximum feed TDS | 10,000 mg/L | 35,000 mg/L | 8,000 mg/L | 2,000 mg/L |
| Continuous pH range | 2–11 | 2–11 | 2–11 | 2–11 |
For potable water systems, WWJF-8040 may be supplied with materials certified to NSF/ANSI 58; certification status must be confirmed for the specific production lot because not all element configurations carry identical approvals. In food and beverage facilities, post-RO carbon filtration or ultraviolet disinfection is typically used because the element itself is not a sanitizing barrier and does not remove dissolved gases or low-molecular-weight uncharged compounds.
In steam generation, WWJF-8040 is used as the first stage of a two-pass RO or as pretreatment for mixed-bed demineralizers. The permeate should maintain conductivity below 20 µS/cm at 25°C; if feed TDS exceeds 3,000 mg/L, a second pass may be necessary to meet 0.1 µS/cm after mixed-bed polishing. In semiconductor and pharmaceutical water systems, the element is placed upstream of continuous electrodeionization and ultraviolet oxidation; here the normalized permeate conductivity target is usually below 10 µS/cm to protect downstream CEDI stacks from scale and organic fouling.
In a 4:2 two-stage array, axial pressure drop along the feed channel reduces net driving pressure from the lead element to the tail element. The 0.71 mm (28 mil) feed spacer used in WWJF-8040 gives a clean vessel differential pressure of 0.4–0.7 bar at 75% recovery when concentrate outlet crossflow velocity remains above 0.10 m/s. If the feed contains high SDI15 or particulate loading, a 0.86 mm (34 mil) spacer variant should be specified because it reduces particulate trapping at the expense of slightly lower active membrane area and higher concentration polarization.
The second stage typically operates with lower flux and higher concentrate TDS. Without interstage boosting, the tail element can exceed 20% recovery and create conditions for calcium carbonate or silica polymerization. Concentrate TDS should be monitored at the final vessel outlet; if it exceeds 8,000 mg/L for a feed with significant silica, the system recovery should be reduced or antiscalant dosing adjusted. Startup pressurization should be ramped at no more than 0.5 bar/s, and shutdown should avoid rapid valve closure that can generate pressure transients above 3.4 bar/s and cause element telescoping.
Brine seal leakage is observed after loading if the seal is rolled or unlubricated. A leaking brine seal allows feed bypass between element and vessel wall, lowering differential pressure and increasing apparent salt passage. Brine seals should be replaced at each loading and installed with a food-grade silicone lubricant compatible with EPDM. After loading, a low-pressure flush with permeate or dechlorinated feed for 10–20 min should be performed before the high-pressure pump is started.
Field integrity monitoring is performed by pressure vessel permeate conductivity profiling. A normalized permeate conductivity increase above 15 µS/cm at 25°C on a single vessel indicates brine seal leakage or an element defect; the train should be isolated before conductivity approaches 30 µS/cm to protect downstream mixed-bed resin or CEDI modules.
